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Bolus rheology of texture-modified food - effect of degree of modification.
RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.ORCID iD: 0000-0003-0310-4465
2021 (English)In: Journal of texture studies, ISSN 0022-4901, E-ISSN 1745-4603, Vol. 52, no 5-6, p. 540-551Article in journal (Refereed) Published
Abstract [en]

Swallowing disorders, or dysphagia, require an intake of texture-modified foods progressively softer, smoother and moister depending on the severity of the disorder. Bolus rheology was determined for five healthy subjects for a set of such solid foods regularly given to dysphagia patients. The softest class was gel food, then a smooth timbale which both were compared to the corresponding regular, un-modified food. The foods investigated were bread, cheese, tomato and the combination as a sandwich, all for the respective texture class: gel, timbale and regular food. The subjects chewed until ready to swallow and the expectorated bolus was immediately measured for complex shear modulus and viscosity, and moisture and saliva content were determined. Rheology show that texture-modification influenced bolus rheology with decreased viscosity and modulus for increased degree of modification. Also saliva content as well as chews-to-swallow decreased with degree of modification. Overall, the bolus saliva content was lower for the combination (sandwich) than for the individual components. Saliva content was fairly constant irrespective of food moisture content. The phase angle for all boluses was also relatively constant, indicating a similar bolus structure. All boluses of the texture-modified foods showed high extensional viscosity, which is important for bolus cohesiveness. Bolus rheology rather than food texture determines if a food is safe to swallow and the results show that the intended texture-modification is reflected in the flow properties of the respective boluses. 

Place, publisher, year, edition, pages
2021. Vol. 52, no 5-6, p. 540-551
Keywords [en]
Bolus, dysphagia, rheology, saliva, solid food, texture-modification
National Category
Food Science
Identifiers
URN: urn:nbn:se:ri:diva-52642DOI: 10.1111/jtxs.12598PubMedID: 33760231Scopus ID: 2-s2.0-85104319263OAI: oai:DiVA.org:ri-52642DiVA, id: diva2:1548348
Available from: 2021-04-30 Created: 2021-04-30 Last updated: 2023-05-25Bibliographically approved

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Stading, Mats

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